I have a Red Sea Reefer 250 (36"L x 20"H x 21"W, 54 gallon display) mixed reef. I have SPS at the top and upper mid level and several various LPS. I would like to switch to Kessil lighting. Should I get one Kessil AP9X panel, two Kessil A360XE, or one Kessil A500X. The A500X claims to have a 36 x 36 spread.
